We played the second of the Talavera scenarios from Jonathon Jones' O'er the Hills Early Peninsular War Scenarios book this weekend. The night attack leads to a very different sort of scenario as troops stumble around in the dark, trying to keep to their line of advance but with a 60% chance on any move veering off to the left or right. The darkness also impacts the ability to fire or execute close combat as visibility is in d10 inches, with us rarely rolling over a 5 in the entire game! On a number of occasions advances on both sides had to be delayed as brigadiers went looking for lost battalions to bring them back in line but despite all of this, we still managed to have a battle!
Here is the full AAR if you are interested:
https://tinywarsplayedindoors.blogspot.com/2023/01/talavera-night-attackjuly-27th-1809.html